<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>斐波那契数列</title>
</head>
<body>
<script>
    function qu(n) {
        if ( n == 1 || n == 2){
            return 1;
        }else{
            return qu(n-1)+qu(n-2);
        }
    }
    console.log(qu(25));
</script>
</body>
</html>